wwp@yahoogroups.com:
Re: Moire effect
Bernhard Vogl 2005-Mar-28 23:09:00
Hello Bostjan
If you're talking about the sky, this clearly looks like banding.
Banding is caused by high compression in images with very subtile color
changes. Best solution is to increase jpeg-quality...
Quicktime Pro has "high quality" settings which are said to be able to
reduce banding artifacts in some cases (screen with low color settings
etc.) - maybe this can help.
If you want to see a wonderful moire example, take a look at my
Naschmarkt-Panorama
http://bernie.x-net.at/fotos/panoramas/naschmarkt.html -> turn around
180 degrees, look at the lady with the black/white jacket and move the
panorama slowly...
Best regards
Bernhard
Bostjan Burger wrote:
>Thanks "pano-fellows". I tried some hints and reduced ( a bit of ) "the banding" with the noise filter/Median. I am still trying to figure out what caused the banding - as the original photos were quite large ( 4288x 2848 ) the problem maid be with the software ( I used 8 shots + zenit, nadir - with Photovista, hm..it seem that I am the only one who use this software here ...).
>However...I will do some more tests and find out the reason...hope so...
>
>;) Bostjan
>
>Uri cogan <#removed#> wrote:
>Bostjan:
>
>
>
>>I discovered in Sunday evening during
>>the stichin process that photos have kind of Moire effect and the
>>stiched pano too [
>><http://128.32.102.88:8090/gen/view/wwp305/html/BostjanBurger.html>http://128.32.102.88:8090/gen/view/wwp305/html/BostjanBurger.html
>>]. I
>>have noticed the Moire only on the sky...
>>
>>
>
>This does not look like Moir? to me, but like "banding".
>
>This could be due to over-compression, but it may
>also have something to do with the way you
>correct for chromatic aberration and for the
>vignetting of the original images.
>
>I was using a Photoshop action to correct for
>these things, but then I started to import my
>Nikon D70 fisheye images into Photoshop using the
>"Camera Raw" filter. I found that it gives me
>very good control over Chromatic aberration
>(colour fringing) and over the vignetting (light
>fall-off) with very little or no visible banding
>in the sky areas.
>
>One example of this is at http://www.uricogan.com/qtvr/ferry.html
>
>And.. by the way, my submission to "Marketplace"
>is at
>http://128.32.102.88:8090/gen/view/wwp305/html/UriCogan.html
>
>:-) Comments/critiques are welcome :-)
>
>
>